Let-off mechanism for looms



s. JONES. LET-OTFMIEQHANISM FOR LOOMS. No. 289.420. Patented Dec. 4, 1883.-

Witnesses. Inventor. I

UNITED STATES PATENT Unites, Y

STEPHEN H. JONES, or LOWELL, MASSACHUSETTS.

LET-OFF MECHANISM FORLOOMS.

SPECIFICATION forming part of Letters Patent No. 289,420, dated December 1883.

Application filed September 25, 1879.

To all whom it 11mg concern/r Be it known that I, STEPHEN H. J onus, of Lowell, in the county 01' Middlesex and Gon1- monwealth of Massachusetts, have invented a new and useful Improvement in Let-Off Mech anisms for Looms, of which the following is a specification.

My invention consists in the combination of a pinion,-two differential gears, one of said gears being fixed and the other being secured to the beam pinion shaft, said a shaft, the beam-pinion, the beam-gear, the ratchet, a lever provided with a pawl, a connecting-rod, and another lever adapted to be actuated by the motion of the sword of the lay, that being the specific means for accomplishing the motion of the warp-beam; also, in the combination of a pinion, two differential "gears, one of said gears being fixed and the other being secured to the beam-pinion shaft, said shaft, the beam-pinion, the beam-gear,the ratchet, the lever first-above named provided with a pawl, another lever, a connecting-rod, another rod, and the whip-roll provided with an arm, to bring the pawl forward and to place said last-named lever in a position to be actuated by the sword of the lay; also, in the combina tion of a hand-wheel, a pinion, two differential gears, one of said gears being fixed and the other being secured to the beam-pinion shaft, said shaft, the beam-pinion, the beamgear, and the ratchet, to enable the warps to be tightened or loosened by hand.-

In the accompanying drawings, Figure 1 is a side elevation of a loom-frame, to which my invention is attached; and Fig. 2 is an end elevation of the same, the take-up mechanism being partly shown in Fig. l.

A is the frame; B, the yarn-beam, provided with the gear 0, secured to the head and concentricwith it; D, the whip-r011,provided with a longitudinal rib or projection; E, the whiproll arm, secured to the end of the shaft of the whip-roll; F, the tension-spring rod, the rear end (theright-hand end in Fig. 1) of which is pivoted to the lower end of the arm E and the other end of which rod slides inabracket, Z, on the loom-frame; G, the tension-spring on the rod F, between the bracket Z and the collar H 11, the collar on the rod F, set by a screw (which passes through one side of the V from the arm E as to insure the requisite resistance to the forward motion of said arm.

and thereby to secure the proper amount of tension on the warps X, passing overthe whip- Q roll D from the yarn-beam B; I, the lever, against the upper end. of which the front end of the rod F strikes when the tension of the warps over the rib of the whip-roll is sufficient to throw the arm E forward, said lever being pivoted a little below its upper end, and being bent forward at its lowerend and passing between the hook K and the frame A,

and being thenbent out at right angles to said frame in front of said hook; K, the hook on the sword J of the lay, being a rod standing out from the sword and bent up nearly parallel with the sword on the outside of the frame. The take-up motion consists of a ratchet, T, and impelling-pawl T, operated by an eccentric on thecrankshaft Y, a retainingpawl, T, and a series of gears (one of which 7 is attached to the sand-roll and another of which turns with the ratchet T) and the cloth- '.beam, the object of the take-up being to roll the cloth as fast as it is woven on the clotlr beam. All of the parts named in the above description are the same as commonly used.

L is the beam-pinionstand, secured to the frame A and supporting the beam pinion shaft M, (shown by dotted lines, Fig. 2,) which runs parallel to the yar11-beam B. On the inner end of the shaft M is securedthe beampinion N, which takes into the gear 0. These parts are also old.

Around the shaft M is the stationary gear 0, fixed to the stand L, or cast in one piece with it, or otherwise prevented from turning. The gear 0 is fast to the shaft M, and has more teeth than the gear 0, (say fourteen teeth on the gear 0 to twelve teeth on the gear 0 for ordinary work; for finer work, one tooth less on the gear 0 than on the gear O;) but these gears O O are of the Same diameter. The ratchet-wheel P is loose on the shaft M, and is provided with ahub on itsouter face. The

into the two gears O It will be seen that if the ratchet P be turned in the direction of its arrow, the pinion S will roll around the differential gears O O, and as the gear 0 has a greaternuinber of teeth than the stationary gear O,the gear 0 will be revolved slowly in the same direction as the ratchet P, the pinion S evening the teeth of the gears O O and causing the gear 0 to advance with one revolution of the ratchet P as many teeth as the gear 0 has in excess of the gear 0. Thus the revolution of the ratchet P revolves the shaft M, to which the gear 0 is fixed, and the pinion N, causing the yarn-beam B to revolve in the opposite direction,and thereby unwinding the warps from the yarnbeam. The lower end of the lever Q is connected by the rod U to the lower end of the lever I, so that when the tension of the warps (the line X, Fig. 1, representing at its left-hand end cloth and at its right-hand end warps) is sufficient to throw the upper end of the lever I forward-that is, to the left in Fig. 1as hereinbefore explained, thelower end of said lever I will be thrown back toward the ratchet P. bringing the upper end of thelever Q with the pawl R forward. WVhen the lever I is in this position the next stroke (forward) of the lay will cause the hook K to knock the lower end of the lever I forward, and the pawl R, consequently, backward, turning the ratchet P and unwinding the warps from the yarnbeam. A hand-wheel, WV, fastened to thehub of the ratchet, enables the shalt M to be turned by hand when necessary.

Heretofore it has been necessary to use a friction device to prevent the action of the lay from pulling the warps too rapidly from the yarn-beam; but it will be seen that no amount of force applied to the warps or to the yarnbeam, or even to the beam-pinion or its shaft,

bcam except as the motion of the ratchet P lets them off.

1 claim as my invention- 1. The combination of the pinion S, the differential gears O 0, one of said gears, 0, being fixed and the other, 0, being secured to the beam-pinion shaft M, said shaft M, the beampinion N, the beam-gear O, the ratchet P, the

lever Q, provided with the pawl R, the conmeeting-rod U, and the lever I, adapted to be actuated by the motion of the sword of the lay, as and for the purpose specified.

2. The combination of the pinion S, the differential gears O 0, one of said gears, 0, being fixed and the other, 0, being secured to the beam-pinion shaft M, said shaft M, the beampinion N, the beam-gear O, the ratchet P, the lever Q, provided with the pawl R, the lever I, the connecting-rod U, the rod F, and the whip-roll D, provided with the arm E, as and for the purpose specified.

3. The combination of the hand-wheel WV, the pinion S, the differential gears O 0, one of said gears, 0, being fixed and the other, 0, being secured to the beam-pinion shaft M, said shaft M, the beam-pinion N, the beamgear 0, and the ratchet P, as and for the purpose specified.

STEPHEN H. JONES. Witnesses:

ALBERT M. MOORE, THOMAS E. GARITY. 

